I am trying to alter the audit_trial parameter to 'db,extended' as need to log SQLTEXT and SQLBIND into the SYS.AUD$.
But when I tried to alter the system parameter it gives me the below error.

Connected to Oracle Database 11g Release 11.2.0.2.0Connected as SYS

SQL> ALTER SYSTEM SET audit_trail=db,extended SCOPE=SPFILE;

ALTER SYSTEM SET audit_trail=db,extended SCOPE=SPFILE

ORA-32001: write to SPFILE requested but no SPFILE is in use

SQL> ALTER SYSTEM SET audit_trail=db,extended;

ALTER SYSTEM SET audit_trail=db,extended

ORA-02095: specified initialization parameter cannot be modified

SQL>

Currently there is no server parameter file (SPFILE) in use for this database.
Is it not possible to alter the audit_trail parameter without using SPFILE scope?
I highly appreciate all your help to overcome this issue.